Question: What is the question to: "The series also originated much tie-in merchandise, making the Harry Potter brand worth in excess of $15 billion."? The topic is Harry Potter.
Answer: "how much are the harry potter movies worth?"

Question: What is the question to: "Area code 810 is the telephone area code serving eastern Michigan ."? The topic is Area code 810.
Answer: "what area code is 810?"

Question: What is the question to: "In the maintenance of file systems , defragmentation is a process that reduces the amount of fragmentation ."? The topic is Defragmentation.
Answer:
"What is the disk defragmenter tool?"